[5] Romero made his debut in Game Changer Wrestling at GCW Road To Survival on April 23, 2017, where he defeated Danny Havoc in an ultraviolent match.

[7] At GCW Worst Behavior 2019 on August 22, he teamed up with Los Mazisos (Ciclope and Miedo Extremo) in a losing effort against Drew Parker, G-Raver and Jimmy Lloyd.

[8] One day later at GCW The New Face Of War 2019 he teamed up with Isami Kodaka and Takashi Sasaki to defeat Alex Colon, Eric Ryan and Masashi Takeda.

[9] At GCW Dead On Arrival on September 27, 2022, he teamed up with his "ERE" stablemates Drew Parker and Toshiyuki Sakuda in a losing effort against Mega Bastards (Alex Colon and John Wayne Murdoch) and Rina Yamashita.

[13] He took part in the 2021 edition of Big Japan Pro Wrestling's Ikkitousen Strong Climb, where he competed in the Block A which he won with a total of six points after going against Masaya Takahashi, Abdullah Kobayashi and Jaki Numazawa, but fell short to Drew Parker in the semifinals.